BOGOR, Indonesia (Reuters) – Scrolling through dating websites a year ago, Indonesian app developer Lindu Pranayama realised there were a lot of married men looking for another wife – but few online services to meet their needs.

“When they go to regular dating sites, they don’t see options for polygamy. They don’t see options for finding second, third or fourth wives,” he said.

Enter “AyoPoligami” – a new smartphone app developed by Mr Lindu, which aims to “bring together male users with women who are willing to make ‘big families’.”

Loosely translated as “Let’s do polygamy”, the Tinder-style dating app has already stirred up controversy since its April launch in Indonesia, where over 80 per cent of the 250 million population are Muslim and polygamy is legal.

Muslim men can take up to four wives in Indonesia, the world’s most populous Muslim country, if permission is granted by a court and the first wife gives her consent.

Court officials could not provide figures of how many people in Indonesia are polygamous, but activists say cases of men giving false information to gain permission and manipulation of women are common.

The app has been downloaded over 10,000 times before it stopped registering new members following concerns of fake accounts were being set up, and men using the site without the knowledge of their first wives.

A new version is set to be launched on Oct 5, and will impose stricter rules on users, including requiring them to provide an identification card, marital status and a letter of permission from their first wives.

Mr Iyus Yusuf Fasyiya, an Indonesian factory worker who has two wives, said he used the app to share tips with other users on how to maintain a polygamous marriage.

“Many members are looking for wives – they ask about how to start, how to maintain polygamous marriages, and also government regulations,” he said from his home village in Bogor, about 90-minute drive from the capital Jakarta.

The 37-year-old dodged questions about whether he was using the app to look for another wife, but said he continues to learn about polygamy, after he took on his second wife six years following his first marriage in 2000.

“It just happened, this is what God planned for me,” said Mr Fasyiya, who takes turns to see his two wives and five children who live in nearby villages.

The majority of the app users were men, but there were also about 4,000 women who have registered, the app developer said.

Lawyer Rachmat Dwi Putranto, who deals with marriage matters, said polygamy is “not that easily achieved” as Indonesian courts will only give permission if the first wife is disabled, ill or cannot bear children.

But Ms Indriyati Suparno, a commissioner from the government-backed National Commission on Violence Against Women, said the app was trying to “normalise polygamy”.

“The reality is women tend to be the victims of domestic violence in a polygamous marriage – polygamy is a form of violence against women,” she said.

Indonesia’s Women’s Empowerment and Child Protection Ministry said it was up to individuals if they wanted to use the app because polygamy is legal as long as it can be done in a fair manner.

“For us what is important is whether the women and children are protected in polygamous marriages,” the ministry’s spokesman Hasan, who uses one name, told the Thomson Reuters Foundation.

Mr Iyus said he will continue to refer to the app to learn how to juggle his two families.

“Me and my wives, we’re committed to showing people that polygamy isn’t as scary as they think,” he said. “We’re trying to make it work.”